Love getting mail like this

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fljp2002

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Just got home and had two packages waiting for me:

Bipod and some new ammo to test.

I guess i may have to go to the range on Sat.

image by fljp, on Flickr

Been looking fwd to trying some SK and Lapua to compare with CCI, Eley (remington), sellier and Aguilla have been shooting. Ammo report to come out, bad part is now that I have a bipod I will need to reshoot all the other brands as well.
 
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CenterX is my go-to for warm weather shooting out of my CZ455 with 20" Lilja Barrel (.3-.4" at 50m, and .8" 5-rd groups at 100m), but wouldn't bother testing CenterX in the winter. Ive noticed it takes 7-10 rounds to warm everything up (which doesn't happen with SK Rifle Match or SK Biathlon) before im hitting my point of aim. After 25-30mins, you will have to re-warm everything up before it starts to group. Ill caveat a few things by saying: gun was stripped down and cleaned a week prior, re-assembled and re-torqued to my previous specs, both were then seasoned with 100rds of CenterX (CZ) or RM (Dlask) 4 days prior to this test, everything was shot at 42m using a labradar to chrony the rounds and timestamp each shot.

In speaking with Asmir at Tesro, we think the lube on that particular round just doesn't like the cold. See pics below. I've noted how long the gun has had to cool, or acclimatize to the -11*C it was that day, as well as how long the ammo has been exposed to outdoor temps. I did shoot 2 mags with the ammo next to my body (to see if ammo temp affected the groups). Speeds from the labradar are also included.

Enjoy the testing! It can definitely be fickle.

Center X:
i-PSWMFLJ-X3.jpg


SK Biathlon:
i-P9HQ537-X3.jpg


SK Rifle Match (from a 16" Dlask DAR22):
i-SZNdNsr-X3.jpg
 
Thanks for sharing! I love this rimfire game. I definitely need to test more types of ammo. I was reading that groups tend to open up on the CenterX when temps dip below 40F. So you're saying it's the lube that causes that?
 
armorman said:
So you're saying it's the lube that causes that?
Click to expand...

I cant say for sure, but that seems to be the only variable that we couldn't isolate (without knowing makeups of the powder/priming compound).

If it was a gun temperature issue, then I would expect to see the same stringing with any type of ammo (which it did not do with SK Biathlon)

If it was an ammo temp issue, then I wouldn't expect to see stringing on the lot that was kept next to my body.
 
chrisward3 said:
CenterX is my go-to for warm weather shooting out of my CZ455 with 20" Lilja Barrel (.3-.4" at 50m, and .8" 5-rd groups at 100m), but wouldn't bother testing CenterX in the winter. Ive noticed it takes 7-10 rounds to warm everything up (which doesn't happen with SK Rifle Match or SK Biathlon) before im hitting my point of aim. After 25-30mins, you will have to re-warm everything up before it starts to group. Ill caveat a few things by saying: gun was stripped down and cleaned a week prior, re-assembled and re-torqued to my previous specs, both were then seasoned with 100rds of CenterX (CZ) or RM (Dlask) 4 days prior to this test, everything was shot at 42m using a labradar to chrony the rounds and timestamp each shot.

In speaking with Asmir at Tesro, we think the lube on that particular round just doesn't like the cold. See pics below. I've noted how long the gun has had to cool, or acclimatize to the -11*C it was that day, as well as how long the ammo has been exposed to outdoor temps. I did shoot 2 mags with the ammo next to my body (to see if ammo temp affected the groups). Speeds from the labradar are also included.

Enjoy the testing! It can definitely be fickle.

Center X:
i-PSWMFLJ-X3.jpg


SK Biathlon:
i-P9HQ537-X3.jpg


SK Rifle Match (from a 16" Dlask DAR22):
i-SZNdNsr-X3.jpg
Click to expand...

Thanks for sharing your research.
 
With the snow/rain we just had it will take a couple days before our range us ready. Are you shooting at PSC? What rifle are you planning to use? Looking forward to the test. Enjoy.
 
When it comes down to it, Center X should not suffer a greater degree of deterioration in accuracy than the other ammo made by SK/Lapua. It uses the same lube.

Where the advantage with biathlon ammo comes in during colder temperatures is the priming compound as ignition is affected by temperature.
 
chrisward3 said:
In speaking with Asmir at Tesro, we think the lube on that particular round just doesn't like the cold. See pics below. I've noted how long the gun has had to cool, or acclimatize to the -11*C it was that day, as well as how long the ammo has been exposed to outdoor temps. I did shoot 2 mags with the ammo next to my body (to see if ammo temp affected the groups). Speeds from the labradar are also included.
Click to expand...

What I find really interesting and peculiar about this, is that the vertical ladder created as you warm up the gun does not seem to correlate with low muzzle velocities from a cold rifle climbing up as you shoot. It's as if velocity has no relationship to the vertical stringing that is occurring. It might make sense if the lube stiffened up in the cold barrel and dragged the muzzle velocity down, gradually warming up and allowing higher velocities as the shots climb in relation, but this does not seem to be occurring. I might have thought the barrel warped downward with the stress imparted from contraction due to the cold, but the phenomenon appears ammo related, as this theory would be evident with all ammo if it were the case.

So, how would the lube have such a drastic effect on vertical, without an obvious correlation to velocity? I haven't got a clue.
 
RabidM4U5 said:
What I find really interesting and peculiar about this, is that the vertical ladder created as you warm up the gun does not seem to correlate with low muzzle velocities from a cold rifle climbing up as you shoot. It's as if velocity has no relationship to the vertical stringing that is occurring. It might make sense if the lube stiffened up in the cold barrel and dragged the muzzle velocity down, gradually warming up and allowing higher velocities as the shots climb in relation, but this does not seem to be occurring. I might have thought the barrel warped downward with the stress imparted from contraction due to the cold, but the phenomenon appears ammo related, as this theory would be evident with all ammo if it were the case.

So, how would the lube have such a drastic effect on vertical, without an obvious correlation to velocity? I haven't got a clue.
Click to expand...

That's what has me scratching my head as well. Any cause seems to be refuted by another piece of data (dispersion on paper, MV, temps, etc..). The labradar tracked MVs out to 40m, so I may try and graph them round to round and see if that reveals anything.
 
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